North Dakota Stratigraphy Archaeotherium ROCK ROCK UNIT COLUMN PERIOD EPOCH AGES MILLIONS OF YEARS AGO Common Name: Holocene Oahe .01 Pig-like

Coleharbor Pleistocene QUATERNARY Classification: 1.8 Pliocene Unnamed 5 Miocene Class: Mammalia 25 Arikaree Order: Artiodactyla Family: Entelodontidae Brule

38 South Heart Skull of the giant pig-like mammal, Archeotherium. 400 mm long. Chadron Chalky Buttes Oligocene . Stark County. North Dakota State Camels Butte Golden 55 Valley Bear Den Fossil Collection.

Sentinel Butte Description: TERTIARY Archaeotherium was similar in appearance to the living and grew to lengths of about 4 feet. It had an elongate skull with unusual protrusions of bone on the lower jaws beneath the eyes. Bullion

Paleocene Creek These boney knobs probably provided anchors for the powerful jaw muscles. Archaeotherium mostly ate roots and tubers but

Slope with its powerful jaws and teeth could eat most anything, even

Cannonball carrion, like modern pigs. The strong shoulder and neck muscles suggest that these spent much of their time rooting and Ludlow 65 grubbing in the ground. Large olfactory lobes indicate that they Hell Creek had a keen sense of smell.

Fox Hills

ACEOUS Pierre CRET

84 Niobrara

Carlile

Carbonate Calcareous Shale Claystone/Shale

Siltstone Sandstone Sand & Gravel

Mudstone Lignite Glacial Drift

Archaeotherium. Painting courtesy of Simon and Schuster Publishing Company.

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